diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b9e4e67..d80c5f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,6 +82,10 @@ jobs:
       - name: Run tests
         run: uv run pytest test tests -q
 
+      # The verifier bridge needs OCP, which the SDK and the suite above never do: it is overlaid for this one run.
+      - name: Verifier bridge (OCP)
+        run: uv run --with "cadquery-ocp-novtk>=7.9.3.1,<8" pytest src/cpp/tests/python/test_verify_bridge.py -q
+
   editor-e2e:
     needs: occt
     # The editor tests that boot a real marimo kernel (about a minute); the main
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0592f98..85efdbf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -313,6 +313,9 @@ jobs:
         run: |
           .venv/bin/python -m pytest test tests -q
           .venv/bin/python -m pytest src/cpp/tests/python -q
+          # Last: the verifier bridge needs OCP, which nothing above may find installed.
+          uv pip install --python .venv/bin/python "cadquery-ocp-novtk>=7.9.3.1,<8"
+          .venv/bin/python -m pytest src/cpp/tests/python/test_verify_bridge.py -q
 
   release:
     name: Build the skill and publish the release
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d746aab..645baa7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,16 @@ user-facing notes live in [`docs/updates/`](docs/updates/) (English and
 
 ## Unreleased
 
+### Added
+- `simplecadapi.verify` (`to_ocp`, `from_ocp`) and the `verify` extra (`pip install "simplecadapi[verify]"`, OCP 7.9
+  without VTK) for verifier scripts: `shape.wrapped` is the SDK's own binding and OCP functions reject it. The SDK
+  itself still never imports OCP. The skill gains `references/discipline/verifier-scripts.md` with the recipes
+  (volume, bounds, validity, point in solid, distance, overlap) and a verifier skeleton.
+
+### Removed
+- The `fem` extra (`gmsh` and `ccx2paraview[VTK]`) and the README steps that used it; the `gmsh` extra stays. VTK is no
+  longer in the lock file at all.
+
 ## 2.2.7b1 — 2026-10-24
 
 ### Added
diff --git a/README.md b/README.md
index 82c5639..5fa8bac 100644
--- a/README.md
+++ b/README.md
@@ -484,37 +484,6 @@ Both outputs contain the same oriented triangles and require no optional
 remeshing dependency. Control curved-surface accuracy with `linear_deflection`
 and `angular_deflection_degrees`.
 
-### Optional CalculiX FEM workflow
-
-The AP242/Gmsh example also includes an optional CalculiX FEM workflow. Install
-the Python-side FEM dependencies with `uv sync --extra fem`, and install the
-external CalculiX solver separately (on macOS: `brew install
-costerwi/homebrew-calculix/calculix-ccx`). The example uses consistent `mm`,
-`N`, and `MPa` units:
-
-```bash
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/run_calculix.py \
-  --ccx "$(brew --prefix calculix-ccx)/bin/ccx_2.23"
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/visualize_calculix.py
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/study_mesh_convergence.py \
-  --ccx "$(brew --prefix calculix-ccx)/bin/ccx_2.23" \
-  --linear-solver "ITERATIVE CHOLESKY" --solver-timeout 2400
-```
-
-The analysis writes CalculiX `.inp`, `.dat`, `.frd`, solver-log, summary JSON,
-ParaView `.vtu`, and displaced von-Mises PNG artifacts. The preview shows the
-load physical group's yellow boundary and red `-Z` force arrows without
-covering the stress heatmap. The convergence study supports `--resume`; failed
-solver levels are reported separately and never enter the numerical sequence.
-
-The checked-in `-1000 N` study evaluates eleven mesh sizes from `h=3.0 mm` to
-`h=0.25 mm`. A platform requires three consecutive refinement pairs below `5%`
-maximum-displacement change and `10%` peak integration-point von-Mises change.
-The verification level N is `h=0.25 mm` (`0.0331843 mm`, `98.6392 MPa`), so the
-recommended production level N-1 is `h=0.27 mm`. Fine levels use iterative
-Cholesky after a same-mesh comparison at `h=0.375 mm` matched SPOOLES within
-`0.005%`; this avoids the direct solver's in-memory capacity limit.
-
 ## Replayable Operation Graphs
 
 Use an explicit `GraphSession` when a geometry flow outside a notebook should
@@ -681,10 +650,9 @@ uv run python examples/flange_plate/verify.py
 sca run examples/compact_two_stage_planetary_reducer/compact_two_stage_planetary_reducer.py
 uv run python examples/compact_two_stage_planetary_reducer/export_mjcf.py
 
-# FEM (AP242 STEP -> Gmsh volume mesh -> Calculix statics)
+# Gmsh volume mesh (AP242 STEP -> volume mesh)
 uv run python examples/ap242_gmsh_volume_mesh/export_step.py
 uv run --extra gmsh python examples/ap242_gmsh_volume_mesh/export_fem_mesh.py
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/run_calculix.py
 ```
 
 To try the editor on a real model, `sca example u_link` copies a motor mount
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 811631a..cc581e8 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -438,33 +438,6 @@ STL 与 OBJ 共用 OpenCASCADE 对求值后 BREP 的直接三角化。两种格
 定向三角面，不再需要可选 remeshing 依赖。曲面精度由 `linear_deflection` 和
 `angular_deflection_degrees` 控制。
 
-### 可选 CalculiX FEM 流程
-
-AP242/Gmsh 示例还包含可选 CalculiX FEM 流程。Python 侧依赖通过
-`uv sync --extra fem` 安装；CalculiX 求解器需要单独安装（macOS：
-`brew install costerwi/homebrew-calculix/calculix-ccx`）：
-
-```bash
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/run_calculix.py \
-  --ccx "$(brew --prefix calculix-ccx)/bin/ccx_2.23"
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/visualize_calculix.py
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/study_mesh_convergence.py \
-  --ccx "$(brew --prefix calculix-ccx)/bin/ccx_2.23" \
-  --linear-solver "ITERATIVE CHOLESKY" --solver-timeout 2400
-```
-
-分析统一使用 `mm`、`N`、`MPa`，输出 CalculiX `.inp`、`.dat`、`.frd`、求解日志、
-摘要 JSON、ParaView `.vtu` 和位移放大后的 von Mises 云图 PNG。图中用黄色轮廓
-标出载荷 physical group，并用红色 `-Z` 箭头表示载荷方向，不覆盖应力热力图。
-收敛研究支持 `--resume`；失败的求解级别单独记录，不会混入数值序列。
-
-仓库中的 `-1000 N` 研究从 `h=3.0 mm` 加密到 `h=0.25 mm`，共 11 级。平台要求
-连续三组细化同时满足最大位移变化低于 `5%`、积分点峰值 von Mises 应力变化低于
-`10%`。第 N 级验证网格为 `h=0.25 mm`（`0.0331843 mm`、`98.6392 MPa`），
-因此生产计算推荐第 N-1 级 `h=0.27 mm`。细网格使用迭代 Cholesky；在
-`h=0.375 mm` 同网格上与 SPOOLES 的位移和峰值应力差异均低于 `0.005%`，从而
-绕过直接求解器的内存容量限制。
-
 ## 可重放操作图
 
 notebook 之外的几何流程需要检查、序列化或重放时，使用显式 `GraphSession`：
@@ -572,10 +545,9 @@ uv run python examples/flange_plate/verify.py
 sca run examples/compact_two_stage_planetary_reducer/compact_two_stage_planetary_reducer.py
 uv run python examples/compact_two_stage_planetary_reducer/export_mjcf.py
 
-# FEM（AP242 STEP -> Gmsh 体网格 -> CalculiX 静力）
+# Gmsh 体网格（AP242 STEP -> 体网格）
 uv run python examples/ap242_gmsh_volume_mesh/export_step.py
 uv run --extra gmsh python examples/ap242_gmsh_volume_mesh/export_fem_mesh.py
-uv run --extra fem python examples/ap242_gmsh_volume_mesh/run_calculix.py
 ```
 
 想在真实模型上试用编辑器：`sca example u_link` 把一个电机座（两个零件 notebook 加
diff --git a/docs/skill/SKILL.md b/docs/skill/SKILL.md
index 236741f..abc351e 100644
--- a/docs/skill/SKILL.md
+++ b/docs/skill/SKILL.md
@@ -208,6 +208,7 @@ print(len(rebuilt))
 - `references/workflows/` — goal-oriented workflows, including drawing reconstruction
 - `references/domains/` — capability domains, including drawing inspection
 - `references/discipline/` — modeling knowledge and invariants
+- `references/discipline/verifier-scripts.md` — writing a verifier script (OCP through `simplecadapi.verify`)
 - `references/SDK_OVERVIEW.md` — package-level map
 - `references/inspect/brep-reverse-engineering.md`
 - `references/domains/addon-development.md` — `sca` addon CLI and authoring guide
diff --git a/docs/skill/references/discipline/geometric-validation.md b/docs/skill/references/discipline/geometric-validation.md
index 40a12ff..2b64fff 100644
--- a/docs/skill/references/discipline/geometric-validation.md
+++ b/docs/skill/references/discipline/geometric-validation.md
@@ -29,6 +29,10 @@ invalid — correct bounds and volume, one bad face — which survives until the
 next operation fails far from the cause. Gate every boolean result, not just
 the final one.
 
+A verifier that measures with the full OCCT toolbox (point classification,
+minimum distance, Boolean overlap) is covered by
+`references/discipline/verifier-scripts.md`.
+
 ## Incremental grounding
 
 Every major step prints a small QL-derived fact: selected face count, a
diff --git a/docs/skill/references/discipline/verifier-scripts.md b/docs/skill/references/discipline/verifier-scripts.md
new file mode 100644
index 0000000..904d65f
--- /dev/null
+++ b/docs/skill/references/discipline/verifier-scripts.md
@@ -0,0 +1,147 @@
+# Discipline: Verifier Scripts
+
+A verifier script measures a finished model against the specification and exits
+non-zero when a requirement fails. It is separate from the modeling script: it
+imports the model, measures it independently, and prints one line per check.
+
+## Evidence labels
+
+- **SDK contract:** `simplecadapi.verify.to_ocp(shape)` returns an OCP
+  `TopoDS_Shape` copy of any SDK shape; `from_ocp(shape)` returns the SDK shape
+  of an OCP shape. `Solid.get_volume()`, `simplecadapi.inspect.brep` and QL
+  need no extra install.
+- **Validation guidance:** the checks and the skeleton below are
+  recommendations, not SDK methods.
+
+## Use the SDK first, OCP for the rest
+
+Measure with the SDK where it can answer: `get_volume()`, QL for face and edge
+facts, `inspect.brep` for validity and shell closure
+(`references/discipline/geometric-validation.md`). Reach for OCP only for what
+the SDK does not expose: point-in-solid classification, minimum distance
+between shapes, Boolean overlap volume, mass-property centroids and inertia.
+
+The SDK itself does not use OCP. Install it for verifier scripts only:
+
+```bash
+pip install "simplecadapi[verify]"     # OCP 7.9, the OCCT generation the SDK ships
+```
+
+## `shape.wrapped` is not an OCP shape
+
+`shape.wrapped` is the SDK's own binding. Passing it to an OCP function fails
+with `incompatible function arguments`. Convert with `to_ocp`:
+
+```python
+from simplecadapi.verify import to_ocp
+
+BRepGProp.VolumeProperties_s(solid.wrapped, props)        # TypeError
+BRepGProp.VolumeProperties_s(to_ocp(solid), props)        # works
+```
+
+`to_ocp` copies through OpenCASCADE's binary format (milliseconds for a part).
+Convert once per shape and reuse the result; tags and tracking history stay on
+the SDK shape. An OCP shape you built yourself comes back with `from_ocp`.
+
+The other direction has one more step: the SDK's diagnostic functions
+(`inspect_shape_rbrepinspection`, ...) take the raw shape of an SDK shape, its
+`.wrapped`. For a shape that came out of OCP, pass `from_ocp(shape).wrapped`
+(or keep the SDK shape and pass `solid.wrapped`).
+
+## Recipes (OCP 7.9)
+
+```python
+from OCP.BRepAlgoAPI import BRepAlgoAPI_Common
+from OCP.BRepBndLib import BRepBndLib
+from OCP.BRepCheck import BRepCheck_Analyzer
+from OCP.BRepClass3d import BRepClass3d_SolidClassifier
+from OCP.BRepExtrema import BRepExtrema_DistShapeShape
+from OCP.BRepGProp import BRepGProp
+from OCP.Bnd import Bnd_Box
+from OCP.GProp import GProp_GProps
+from OCP.TopAbs import TopAbs_IN
+from OCP.TopoDS import TopoDS
+from OCP.gp import gp_Pnt
+
+
+def volume(shape):
+    props = GProp_GProps()
+    BRepGProp.VolumeProperties_s(shape, props)
+    return props.Mass()
+
+
+def bounds(shape):                      # (xmin, ymin, zmin, xmax, ymax, zmax)
+    box = Bnd_Box()
+    BRepBndLib.Add_s(shape, box)
+    return box.Get()
+
+
+def is_valid(shape):
+    return BRepCheck_Analyzer(shape).IsValid()
+
+
+def contains(solid, x, y, z, tol=1e-6):  # solid: an OCP solid, see the cast below
+    return BRepClass3d_SolidClassifier(solid, gp_Pnt(x, y, z), tol).State() == TopAbs_IN
+
+
+def gap(a, b):                          # minimum distance, 0 when they touch or overlap
+    measure = BRepExtrema_DistShapeShape(a, b)
+    assert measure.IsDone()
+    return measure.Value()
+
+
+def overlap_volume(a, b):               # interference between two parts
+    common = BRepAlgoAPI_Common(a, b)
+    assert common.IsDone()
+    return volume(common.Shape())
+```
+
+- `to_ocp` returns a generic `TopoDS_Shape`. Functions that need the concrete
+  type want a cast: `TopoDS.Solid_s(to_ocp(solid))`.
+- OCP 7.9 casts and static methods end in `_s` (`TopoDS.Solid_s`,
+  `BRepGProp.VolumeProperties_s`). OCP 8 renames them; the `verify` extra pins
+  7.9 so documentation and code agree.
+- Do not guess OCP names. Open the class in the OCCT reference, or
+  `help(OCP.<Module>.<Class>)`, before the first call (a method that is not in
+  the documentation does not exist, however plausible it looks).
+
+## Skeleton
+
+```python
+"""verify_bracket.py: exits 1 when a requirement is not met."""
+import math
+import sys
+
+from simplecadapi.verify import to_ocp
+
+from bracket import build           # the modeling script's result: a Solid
+
+checks = []
+
+
+def check(name, ok, detail=""):
+    checks.append(ok)
+    print(("PASS" if ok else "FAIL"), name, detail)
+
+
+part = build()
+shape = to_ocp(part)
+
+check("valid", is_valid(shape))
+check("volume 5151.77 mm3 +-0.1%", math.isclose(volume(shape), 5151.77, rel_tol=1e-3), f"{volume(shape):.2f}")
+x0, y0, z0, x1, y1, z1 = bounds(shape)
+check("height 30 mm", math.isclose(z1 - z0, 30.0, abs_tol=1e-6), f"{z1 - z0:.4f}")
+check("bore is empty", not contains(TopoDS.Solid_s(shape), 0, 0, 15))
+
+sys.exit(0 if all(checks) else 1)
+```
+
+Rules for a verifier:
+
+- Every user-specified dimension gets its own targeted check with the measured
+  value printed; "valid" alone proves nothing about size.
+- Tolerances come from the specification, not from what happens to pass.
+- A check that cannot run (missing OCP, unreadable file) is a failure, not a
+  skip: report it and exit non-zero.
+- Do not edit the model to make a check pass; fix the model or report the
+  discrepancy.
diff --git a/pyproject.toml b/pyproject.toml
index b3242e4..f1f9ec5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,16 +57,18 @@ editor = [
 # simplecadapi.inspect.brep is part of the default install; this extra is kept empty so that
 # `pip install "simplecadapi[inspect]"` from older instructions still works.
 inspect = []
+# Verifier scripts measure models with OCP; the SDK itself never imports it (simplecadapi.verify bridges the two).
+# The build without VTK (same `OCP` import, no 100 MB VTK) and the OCCT generation the SDK ships (7.9): OCP 8 renames
+# the casts and changes signatures.
+verify = [
+    "cadquery-ocp-novtk>=7.9.3.1,<8",
+]
 whucad = [
     "h5py>=3.8",
 ]
 gmsh = [
     "gmsh>=4.15,<5",
 ]
-fem = [
-    "gmsh>=4.15,<5",
-    "ccx2paraview[VTK]>=3.2,<4",
-]
 
 [project.urls]
 Homepage = "https://github.com/PhySpace/SimpleCADAPI"
diff --git a/src/cpp/tests/python/test_verify_bridge.py b/src/cpp/tests/python/test_verify_bridge.py
new file mode 100644
index 0000000..969c306
--- /dev/null
+++ b/src/cpp/tests/python/test_verify_bridge.py
@@ -0,0 +1,129 @@
+"""simplecadapi.verify: SDK shapes to OCP and back, for verifier scripts.
+
+Runs only where OCP is installed (``uv run --with cadquery-ocp pytest ...``); the SDK and the rest of the suite never
+need it.  The verifier recipes of the skill (docs/skill/references/workflows/verifier-scripts.md) are run here too.
+"""
+
+from __future__ import annotations
+
+import math
+
+import pytest
+
+import simplecadapi as scad
+from simplecadapi import verify
+
+ocp = pytest.importorskip("OCP")
+
+from OCP.BRepAlgoAPI import BRepAlgoAPI_Common  # noqa: E402
+from OCP.BRepBndLib import BRepBndLib  # noqa: E402
+from OCP.BRepCheck import BRepCheck_Analyzer  # noqa: E402
+from OCP.BRepClass3d import BRepClass3d_SolidClassifier  # noqa: E402
+from OCP.BRepExtrema import BRepExtrema_DistShapeShape  # noqa: E402
+from OCP.BRepGProp import BRepGProp  # noqa: E402
+from OCP.Bnd import Bnd_Box  # noqa: E402
+from OCP.GProp import GProp_GProps  # noqa: E402
+from OCP.TopAbs import TopAbs_IN, TopAbs_ON  # noqa: E402
+from OCP.TopoDS import TopoDS  # noqa: E402
+from OCP.gp import gp_Pnt  # noqa: E402
+
+
+def part():
+    box = scad.make_box_rsolid(10, 20, 30, bottom_face_center=(0, 0, 0))
+    hole = scad.make_cylinder_rsolid(3, 40, bottom_face_center=(0, 0, -5))
+    return scad.cut_rsolid(box, hole)
+
+
+def volume(shape):
+    props = GProp_GProps()
+    BRepGProp.VolumeProperties_s(shape, props)
+    return props.Mass()
+
+
+def test_the_sdk_wrapped_shape_is_not_an_ocp_shape():
+    with pytest.raises(TypeError, match="incompatible"):
+        BRepGProp.VolumeProperties_s(part().wrapped, GProp_GProps())
+
+
+def test_to_ocp_measures_like_the_sdk():
+    solid = part()
+    shape = verify.to_ocp(solid)
+    assert math.isclose(volume(shape), solid.get_volume(), rel_tol=1e-12)
+    assert BRepCheck_Analyzer(shape).IsValid()
+    box = Bnd_Box()
+    BRepBndLib.Add_s(shape, box)
+    assert [round(v, 6) for v in box.Get()] == [-5.0, -10.0, 0.0, 5.0, 10.0, 30.0]
+
+
+def test_recipes_point_in_solid_distance_and_overlap():
+    solid = verify.to_ocp(part())
+    classify = BRepClass3d_SolidClassifier(TopoDS.Solid_s(solid), gp_Pnt(4, 5, 6), 1e-6)
+    assert classify.State() == TopAbs_IN
+    in_hole = BRepClass3d_SolidClassifier(TopoDS.Solid_s(solid), gp_Pnt(0, 0, 15), 1e-6)
+    assert in_hole.State() != TopAbs_IN and in_hole.State() != TopAbs_ON
+
+    other = verify.to_ocp(scad.make_box_rsolid(2, 2, 2, bottom_face_center=(20, 0, 0)))
+    distance = BRepExtrema_DistShapeShape(solid, other)
+    assert distance.IsDone() and math.isclose(distance.Value(), 14.0, abs_tol=1e-9)  # 20 - 1 - 5
+
+    overlapping = verify.to_ocp(scad.make_box_rsolid(10, 10, 10, bottom_face_center=(0, 0, 25)))
+    common = BRepAlgoAPI_Common(solid, overlapping)
+    # the box overlaps the top 5 mm of the part; the 3 mm hole runs through that slab
+    assert common.IsDone() and math.isclose(volume(common.Shape()), 10 * 10 * 5 - math.pi * 3**2 * 5, rel_tol=1e-9)
+
+
+def test_from_ocp_brings_a_shape_back():
+    original = part()
+    back = verify.from_ocp(verify.to_ocp(original))
+    assert isinstance(back, scad.Solid)
+    assert math.isclose(back.get_volume(), original.get_volume(), rel_tol=1e-12)
+
+
+def test_wrong_arguments_say_what_to_pass():
+    with pytest.raises(TypeError, match="expects an SDK shape"):
+        verify.to_ocp(verify.to_ocp(part()))
+    with pytest.raises(TypeError, match="expects an OCP TopoDS_Shape"):
+        verify.from_ocp(part())
+
+
+def test_a_missing_ocp_names_the_extra(monkeypatch):
+    import builtins
+
+    real = builtins.__import__
+
+    def refuse(name, *args, **kwargs):
+        if name == "OCP" or name.startswith("OCP."):
+            raise ImportError("no OCP")
+        return real(name, *args, **kwargs)
+
+    monkeypatch.setattr(builtins, "__import__", refuse)
+    assert verify.ocp_available() is False
+    with pytest.raises(ImportError, match=r"simplecadapi\[verify\]"):
+        verify.to_ocp(part())
+
+
+def test_the_skill_page_code_runs(monkeypatch):
+    """The recipes and the skeleton of references/discipline/verifier-scripts.md run as written."""
+
+    import re
+    import sys
+    import types
+    from pathlib import Path
+
+    page = Path(__file__).resolve().parents[4] / "docs/skill/references/discipline/verifier-scripts.md"
+    blocks = re.findall(r"```python\n(.*?)```", page.read_text(encoding="utf-8"), flags=re.S)
+    recipes = next(b for b in blocks if "def overlap_volume" in b)
+    skeleton = next(b for b in blocks if "verify_bracket.py" in b)
+
+    bracket = types.ModuleType("bracket")
+    bracket.build = part
+    monkeypatch.setitem(sys.modules, "bracket", bracket)
+
+    namespace: dict = {"__name__": "verifier"}
+    exec(compile(recipes, "recipes", "exec"), namespace)
+    exec(compile(skeleton.replace("sys.exit(0 if all(checks) else 1)", ""), "skeleton", "exec"), namespace)
+    assert namespace["checks"] and all(namespace["checks"]), namespace["checks"]
+    # every recipe answers on the part
+    shape = namespace["shape"]
+    assert namespace["contains"](TopoDS.Solid_s(shape), 4, 5, 6)
+    assert namespace["gap"](shape, verify.to_ocp(scad.make_box_rsolid(2, 2, 2, bottom_face_center=(20, 0, 0)))) == pytest.approx(14.0)
diff --git a/src/simplecadapi/verify.py b/src/simplecadapi/verify.py
new file mode 100644
index 0000000..81e76a1
--- /dev/null
+++ b/src/simplecadapi/verify.py
@@ -0,0 +1,87 @@
+"""Verifier scripts: hand SDK shapes to OCP and take OCP shapes back.
+
+The SDK computes on its own compiled OpenCASCADE (``simplecadapi._cpp``) and does not need OCP.  A verifier script that
+measures a model with the full OCCT toolbox (mass properties, point classification, distances, Boolean overlap, ...)
+is easier to write against OCP, whose API every OCCT reference documents.  Install it with the ``verify`` extra::
+
+    pip install "simplecadapi[verify]"
+
+``shape.wrapped`` is **not** an OCP object: it is the SDK's own binding, and OCP functions reject it with
+``incompatible function arguments``.  Convert instead::
+
+    from OCP.BRepGProp import BRepGProp
+    from OCP.GProp import GProp_GProps
+    from simplecadapi.verify import to_ocp
+
+    props = GProp_GProps()
+    BRepGProp.VolumeProperties_s(to_ocp(solid), props)      # not solid.wrapped
+    print(props.Mass())
+
+The conversion goes through OpenCASCADE's binary format (geometry only, bit-exact doubles, a few milliseconds for a
+part), so it copies: changes made to the OCP shape do not reach the SDK shape; use ``from_ocp`` to bring a result back.
+Tags and tracking history stay with the SDK shape.
+"""
+
+from __future__ import annotations
+
+import io
+from typing import Any
+
+import simplecadapi._cpp as _cpp
+
+__all__ = ["to_ocp", "from_ocp", "ocp_available"]
+
+_INSTALL_HINT = (
+    'OCP is not installed.  Verifier scripts that use OCP need the optional extra: pip install "simplecadapi[verify]" '
+    "(the SDK itself does not use OCP)."
+)
+
+
+def ocp_available() -> bool:
+    """True when OCP can be imported."""
+
+    try:
+        import OCP  # noqa: F401
+    except ImportError:
+        return False
+    return True
+
+
+def _require_ocp() -> None:
+    try:
+        import OCP  # noqa: F401
+    except ImportError as error:
+        raise ImportError(_INSTALL_HINT) from error
+
+
+def to_ocp(shape: Any) -> Any:
+    """The OCP ``TopoDS_Shape`` of an SDK shape (a copy).
+
+    Down-cast it when a function wants the concrete type: ``TopoDS.Solid_s(to_ocp(solid))``.
+    """
+
+    _require_ocp()
+    from OCP.BinTools import BinTools
+    from OCP.TopoDS import TopoDS_Shape
+
+    if not hasattr(shape, "to_brep"):
+        raise TypeError(
+            f"to_ocp expects an SDK shape (Solid, Face, Wire, Edge, Vertex, Compound, ...), got {type(shape).__name__}; "
+            "an OCP shape is already one"
+        )
+    result = TopoDS_Shape()
+    BinTools.Read_s(result, io.BytesIO(shape.to_brep()))
+    return result
+
+
+def from_ocp(shape: Any) -> Any:
+    """The SDK shape (``Solid``, ``Face``, ... as the content says) of an OCP ``TopoDS_Shape`` (a copy)."""
+
+    _require_ocp()
+    from OCP.BinTools import BinTools
+
+    if hasattr(shape, "to_brep"):
+        raise TypeError("from_ocp expects an OCP TopoDS_Shape, got an SDK shape")
+    buffer = io.BytesIO()
+    BinTools.Write_s(shape, buffer)
+    return _cpp.from_brep(buffer.getvalue())
diff --git a/uv.lock b/uv.lock
index ab78e6a..8c61338 100644
--- a/uv.lock
+++ b/uv.lock
@@ -212,21 +212,41 @@ css = [
 ]
 
 [[package]]
-name = "ccx2paraview"
-version = "3.2.0"
+name = "cadquery-ocp-novtk"
+version = "7.9.3.1.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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-    { name = "numpy", version = "2.3.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
+    { name = "cadquery-ocp-proxy" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/68/80/2d3f15215a6ef3029bc4a5a58365cd6979a8d9dd2ca7b97e7ef929381522/ccx2paraview-3.2.0.tar.gz", hash = "sha256:c9f0c8d0fadd7de9a30be1b38ff53ecede49a87659e32b67ba32230d9dafd600", size = 36243, upload-time = "2024-12-19T21:17:20.762Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/88/ce/287c003e8a96771854cac6563ca209a13a1b22a9bc012e32aafed2d5ebe5/cadquery_ocp_novtk-7.9.3.1.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:cee061a62066e58b366d1b0647d7148ffa2b3a7cec08e0e612a59a25b019791a", size = 61702081, upload-time = "2026-05-28T13:07:19.388Z" },
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 ]
 
-[package.optional-dependencies]
-vtk = [
-    { name = "vtk" },
+[[package]]
+name = "cadquery-ocp-proxy"
+version = "7.9.3.1.1"
+source = { registry = "https://pypi.org/simple" }
+wheels = [
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 [[package]]
@@ -3012,13 +3032,12 @@ editor = [
     { name = "websockets", version = "16.1.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" },
     { name = "websockets", version = "17.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
 ]
-fem = [
-    { name = "ccx2paraview", extra = ["vtk"] },
-    { name = "gmsh" },
-]
 gmsh = [
     { name = "gmsh" },
 ]
+verify = [
+    { name = "cadquery-ocp-novtk" },
+]
 whucad = [
     { name = "h5py" },
 ]
@@ -3044,10 +3063,9 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "black", marker = "extra == 'dev'", specifier = ">=23.0" },
-    { name = "ccx2paraview", extras = ["vtk"], marker = "extra == 'fem'", specifier = ">=3.2,<4" },
+    { name = "cadquery-ocp-novtk", marker = "extra == 'verify'", specifier = ">=7.9.3.1,<8" },
     { name = "cryptography", specifier = ">=42.0.0" },
     { name = "ezdxf", specifier = ">=1.4.4" },
-    { name = "gmsh", marker = "extra == 'fem'", specifier = ">=4.15,<5" },
     { name = "gmsh", marker = "extra == 'gmsh'", specifier = ">=4.15,<5" },
     { name = "h5py", marker = "extra == 'whucad'", specifier = ">=3.8" },
     { name = "isort", marker = "extra == 'dev'", specifier = ">=5.0" },
@@ -3070,7 +3088,7 @@ requires-dist = [
     { name = "uvicorn", marker = "extra == 'editor'", specifier = ">=0.54.0" },
     { name = "websockets", marker = "extra == 'editor'", specifier = ">=16.1.1" },
 ]
-provides-extras = ["dev", "drawing", "editor", "inspect", "whucad", "gmsh", "fem"]
+provides-extras = ["dev", "drawing", "editor", "inspect", "verify", "whucad", "gmsh"]
 
 [package.metadata.requires-dev]
 dev = [
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